The Mars Global Surveyor magnetic fields investigation provided fast
vector measurements of the Martian magnetic field over a wide dynamic
range. The fundamental objectives of this investigation were
- to establish the nature of the magnetic field of Mars,
- to develop appropriate models for its representation, which
take into account the internal sources of magnetism and the
effects of the interaction of the solar wind, and
- to map the Martian crustal remanent field to a resolution
consistent with the Mars Global Surveyor orbit altitude and
ground track separation.
- Mars does not presently have a global magnetic field but had
one early in its life, similar to that of Earth. However,
Mars does have very strong crustal magnetic fields, more than
30 times stronger than those of Earth.
- Developed a detailed map of the magnetic fields of crustal
- The absence of magnetization in large impact basins allowed
for the first time to establish the time of cessation of the
Martian dynamo, more than 3.5 billion years ago.
- The absence of a global magnetic field for billions of years
has contributed to the erosion of Mars atmosphere by the solar
wind and the loss of water.
- Established a correlation of the horizontal component of
the magnetic field with upstream solar wind dynamic pressure.
- Studying the interaction of Mars with the solar wind provides
information on how the atmosphere has been stripped away over
the age of the solar system.
- Improving the magnetic field map of crustal sources for dating
the age of the crust and correlating with geology.
- Provide magnetic field measurements to supplement data from
Mars Express (MEX) and Mars Odyssey.
- Correlate solar wind "proxy" data with data from the WIND and